Re: [ecasound] extending the C-API design

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Subject: Re: [ecasound] extending the C-API design
From: Kai Vehmanen (k@eca.cx)
Date: Wed Nov 08 2000 - 00:08:05 EET

On Tue, 7 Nov 2000, janne halttunen wrote:

>> - read access to ecasound per-user resources (~/.ecasoundrc)
> What does this mean exactly?

A function for querying the value-key pairs stored in
~/.ecasoundrc (see 'man ecasoundrc' for the complete list of possible
keys).

>> - object maps
>> - get list of supported audio object, chain op and
>> controller types
> These are related to the -register commands?

Yup. Same information content, but in a more usable format. This is a very
powerful feature, and shouldn't be too difficult to add. A good example of
this is ecawave's effects dialog. Ecawave doesn't directly handle
any effect code. Still its able to provide a usable effect GUI (including
support for native and LADSPA effects + presets!).

For instance with effects, you'd need to get a list of items containing
the following info
        - effect identifier
        - name
        - comma-separated list of parameters

Let's take the new pulse gate as an example. You'd get the following info:
        - eepm
        - "Pulse Gate"
        - Pulse Gate:freq-Hz,on-time-%

So now you know
        1) how to add a new effect of this type (-eepm:arg1,arg2)
        2) effect's name (for building a user-interface)
        3) how many parameters (2 in this case -> you can start
           using the cop-set ia-mode command)
        4) description of each parameter (for the user-interface)

Additionally, a more verbose description of the effect could also be
provided (this is already covered by the C++ APIs, although not
implemented for many effect types).

Same procedure can be applied to audio objects, controllers,
effect presets and LADSPA plugins. 

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